83563919909 has 2 divisors, whose sum is σ = 83563919910. Its totient is φ = 83563919908.

The previous prime is 83563919899. The next prime is 83563919963. The reversal of 83563919909 is 90991936538.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76082188900 + 7481731009 = 275830^2 + 86497^2 .

It is a cyclic number.

It is not a de Polignac number, because 83563919909 - 2¹⁶ = 83563854373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83563919809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41781959954 + 41781959955.

It is an arithmetic number, because the mean of its divisors is an integer number (41781959955).

Almost surely, 2^83563919909 is an apocalyptic number.

It is an amenable number.

83563919909 is a deficient number, since it is larger than the sum of its proper divisors (1).

83563919909 is an equidigital number, since it uses as much as digits as its factorization.

83563919909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14171760, while the sum is 62.

The spelling of 83563919909 in words is "eighty-three billion, five hundred sixty-three million, nine hundred nineteen thousand, nine hundred nine".